▎ 摘　　要

NOVELTY - Preparing graphene dispersion liquid comprises oxidizing the graphite powder using Hummers method to obtain oxidized graphite oxide and carrying out reduction graphene oxide, mixing the reduction graphene oxide and solvent, ball milling 0.01-10 mg/ml of graphene oxide suspension liquid into a ball mill tank at a rotating speed of 30-500 revolutions per minute (rpm) for 2-300 hours to obtain dispersion liquid, centrifuging the obtained dispersion liquid at a rotating speed of 100-15000 rpm to remove thick graphene sheet with a size of 1 mu m, and washing and drying the product in the solvent. USE - The method is useful for preparing graphene dispersion liquid (claimed). ADVANTAGE - The method prepares graphene dispersion liquid in a simple and cost-effective and environmental-friendly manner. DETAILED DESCRIPTION - Preparing graphene dispersion liquid comprises oxidizing the graphite powder using Hummers method to obtain oxidized graphite oxide, chemically reducing graphene oxide, mixing the reduced graphene oxide and solvent to obtain graphene oxide suspension liquid, grinding 0.01-10 mg/ml of graphene oxide suspension liquid into a ball mill machine at a rotating speed of 30-500 revolutions per minute (rpm) for 2-300 hours to obtain dispersion liquid, centrifuging the obtained dispersion liquid at a rotating speed of 100-15000 rpm to remove thick graphene sheet with a size of 1 mu m, and washing and drying the product using solvent.